Concrete pipe joint



l?, 1935. la. J. UKRoPlNA 2,924,438

CONCRETE PIPE JOINT Original Filed Nov. 20, 1933 INVENTOR.

BJ. UK OP//V/q.

rPatented Dec. 17, 1935 'iii PATENT i OFFICE 2,024,488 v v CONCRETE PIPE-'JOINT Bozidar J. Ukropina,

Los Angeles, Calif.

(briginal` application November 20, '1933, Serial No. 698,814. Divideda 13, 1934, SerialNo. 734

nd this application July ,952

2 Claims. (C1. 285-112) 'I'his invention relates to improvements in concrete pipes and joints therefor.

'I'he general object of the invention is to provide an improved concrete pipe construction.

Another object of the invention is to provide an improved joint construction forl joining two lengths of pipe.

A more specic object of my invention is to provide a concrete joint wherein the spigot end includes a bevelled centering member.

Other objects and the advantages of this invention will be apparent from the following description taken in connection with the accompanying drawing wherein:

Fig. 1 is a fragmentary longitudinal section through a modified form of pipe showing one step in the forming of a joint;

Fig. 2 is a view similar to Fig. 1 showing another step in the forming of a joint;

Fig. 3 is a View similar to Fig. 2 showing the completed joint; and,

Fig. 4 is a fragmentary longitudinal section through a modied form of pipe.

'I'his invention is a division of my prior application Serial No. 698,814, filed November 20, 1933, now Patent No. 1,973,967.

Referring to the drawing by reference characters I have indicated my improved concrete pipe generally at 5. As shown the pipe 5 comprises a metal reinforcing cylinder 6 embedded between an inner layer of concrete 1 and an outer layer of concrete 8. At one end of the cylinder 6 I provide a spigot ring 9 which is made of thicker metal than the cylinder and is butt welded thereto and at the opposite end of the cylinder I provide a bell ring I!) which like the spigot ring is made of thicker metal than the cylinder and is butt welded thereto. The bell ring includes an inclined shoulder II and an enlarged end section I2, the inside diameter of which is greater than the outside diameter of the spigot ring 9.

'I'he end of the inner layer of concrete 'I adjacent the spigot ring 9 terminates iiush with the outer end of the spigot ring as at I3 andthe opposite end is set back from the outer end of the bell ring I0 and terminates in a beveled face I4 the outer edge of which engages the inner end of the tapered shoulder II of' the bell ring. The end of the outer layer of concrete adjacent the spigot ring is set back from the outer end of the spigot ring as at I5 and the opposite end terminates flush with the outer end of the bell ring as at I6.

When the two lengths of the pipe 5V are to be joined the spigot ring 9 of one pipe is positioned' in the bell ring I0' of the other pipe and the two pipes moved together until the end I6 of the outer layer of concrete of one pipe engages the end I5 of the outer layer of concrete of the other' pipe. In this position a chamber I1 is formed between the bell and spigot rings and a chamber. I8 is formed between the adjacent ends I3 and I 4 of the inner layers of concrete.

When the lengths are thus joined an annular rope member I9 which is made of lead or is a 10 steel cable is driven into the chamber I'I until it engages the face I5 as shown in Fig. 2. A caulking material 20 such as lead is then driven in Vthe chamber I I between the rope I9 and the outer end of the spigot ring 9 as shown in Fig. 3. 15 Thereafter a fill material 2|, such as cement mortar, is positioned in the chamber I 8.

In Fig. 4 I have indicated a modified form of concrete pipe generally at 22. As shown the pipe 22 is similar in most respects to the pipe 5 20 and like portions thereof are indicated by similarly primed reference characters. In the pipe 22 I may arrange a ring or band 22 which extends about each spigot ring 9 and is secured thereto as by welding. This ring 22 preferably 25 has an outside diameter which is not greater than the inside diameter of the bell ring I2. Also in this type I may employ a solid metal band 23 which is positioned on the spigot 9 adjacent the face I5 of the outer layer of concrete before 30 two sections of the pipe are joined. As shown the band 23 is circular in cross section and is spot welded to the spigot ring but it may be of any cross sectional configuration desired and may be positioned on the spigot ring without securing 35 .it thereto. The outer diameter of the band 23 is slightly less than the inside diameter of the bell ring section I2 so that when two sections of the pipe are joined the band 23' will telescope within the bell ring. After the pipes are thus 40 joined the caulking material 20 is driven into the chamber Il between the band 23 and the outer end of the spigot ring and then the fill material 2| is positioned in the chamber 9'. It will be understood that either the ring 22 or the band 45 23 may be used or omitted depending on the requirements in each installation.

From the foregoing description it will be apparent that I have provided a novel concrete pipe construction and joint for connecting two 50 lengths of the pipe which is simple in construction and highly eiicient in use.

Having thus described my invention I claim:

1. A conduit comprising a plurality of lengths of concrete pipe laid end to end, each of said lengths including a bell section at one end and a reduced spigot section at the opposite end, an annular bend of rigid material rectangular in cross section and positioned on each of said spigot sections and spaced from the outer ends thereof, said band having one face engaging the spigot member and having two faces engaged by the concrete and having one face exposed, said pipes being laid With said spigot sections telescoping in said bell sections and with saidbands telescoped in said bell sections, and a caulking material positioned in the space between adjacent bell and spigot sections and engaging said band.

2. In combination with a plurality of lengths of concrete pipe laid end to end, each of said pipes including a bell section at one end and spigot sections telescoped a reduced spigot section at the opposite end, each of said bell sections having a metal lining therein and each of said spigot sections having a metal band thereon, said lengths being laid with said in said bell sections and with said bell sections positioned in said recesses formed by said collars, a rigid annular metal band positioned on each of 'said spigot bands and spaced from the outer ends of said spigot bands, said metal band being embedded in the concrete, a second band on said spigot end and disposed adjacent said rst band and a caulking material positioned in the space between adjacent bell and spigot sections.

BOZIDAR J. UKROPINA. 

